Open Stack

Hi Team,

I worked on nova quota statistics issue (
https://bugs.launchpad.net/nova/+bug/1284424) happenning when nova-*
processes are restarted during removing instances and was able to reproduce
it. For repro I used devstack and started nova-api and nova-compute in
separate screen windows. For killing them I used ctrl+c. As I found this
issue happened if nova-* processes are killed after instance was deleted
but right before quota commit procedure finishes.

We discussed these results with Markus Zoeller and decided that even though
killing nova processes is a bit exotic event, this still should be fixed
because quotas counting affects billing and very important for us.

So, we need to introduce some mechanism that will prevent us from reaching
inconsistent states in terms of quotas. In other words, this mechanism
should work in such a way that both instance create/remove operation and
quota usage recount operation happened or not happened together.

Any ideas how to do that properly?

Kind regards,
Dmitry
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